// This test contains a manually extruded shape where the 
// start and end vertices touches with identical coordinates.
polyhedron(points = [
  [2.02196e-17, 19.8, 1],
  [-2.02196e-17, 20.2, 1],
  [-2.02196e-17, 20.2, -1],
  [2.02196e-17, 19.8, -1],
  [10.8034, -1.52112, 1],
  [11.16, -1.70232, 1],
  [11.16, -1.70232, -1],
  [10.8034, -1.52112, -1],
  [-10.8034, -1.52112, 1],
  [-11.16, -1.70232, 1],
  [-11.16, -1.70232, -1],
  [-10.8034, -1.52112, -1],
  [2.02196e-17, 19.8, 1],
  [-2.02196e-17, 20.2, 1],
  [-2.02196e-17, 20.2, -1],
  [2.02196e-17, 19.8, -1]
],
  faces = [[0, 5, 4],
  [0, 1, 5],
  [1, 2, 5],
  [5, 2, 6],
  [2, 3, 6],
  [6, 3, 7],
  [3, 0, 7],
  [7, 0, 4],
  [4, 5, 8],
  [8, 5, 9],
  [5, 6, 9],
  [9, 6, 10],
  [6, 7, 10],
  [10, 7, 11],
  [7, 4, 11],
  [11, 4, 8],
  [8, 9, 12],
  [12, 9, 13],
  [9, 10, 13],
  [13, 10, 14],
  [10, 15, 14],
  [10, 11, 15],
  [11, 8, 15],
  [15, 8, 12]
],
  convexity = 2);
